# Dependency Version Fix

## Issue
`ImportError: huggingface-hub>=0.19.3,<1.0 is required for a normal functioning of this module, but found huggingface-hub==1.1.4`

## Root Cause
Version conflict between `transformers` and `huggingface-hub`. The `transformers` 4.x series requires `huggingface-hub<1.0`.

## Solution

### Option 1: Fresh Install (Recommended)

```bash
# Remove existing packages
pip uninstall -y huggingface-hub transformers sentence-transformers

# Reinstall with correct versions
pip install -r requirements_gradio.txt
```

### Option 2: Force Correct Versions

```bash
# Install specific compatible versions
pip install "huggingface-hub>=0.19.3,<1.0" "transformers>=4.36.0,<5.0"
```

### Option 3: Use Virtual Environment (Best Practice)

```bash
# Create fresh environment
python -m venv venv
source venv/bin/activate  # On Windows: venv\Scripts\activate

# Install all dependencies fresh
pip install -r requirements_gradio.txt
```

## Verification

After fixing, verify the installation:

```bash
python -c "import transformers; import huggingface_hub; print(f'transformers: {transformers.__version__}'); print(f'huggingface-hub: {huggingface_hub.__version__}')"
```

Expected output:
```
transformers: 4.36.x or higher (but <5.0)
huggingface-hub: 0.19.x - 0.99.x (but <1.0)
```

## For Hugging Face Spaces

The `requirements_gradio.txt` has been updated with correct version constraints:

```txt
huggingface-hub>=0.19.3,<1.0
transformers>=4.36.0,<5.0
```

When you push to HF Spaces, it will automatically use the correct versions.

## Why This Happened

The original `requirements_gradio.txt` had:
- `huggingface-hub==0.26.2` (pinned)
- `transformers==4.45.0` (pinned)

These are compatible, but if pip resolved dependencies differently or if there was a cached version, it might install `huggingface-hub>=1.0`, which breaks `transformers` 4.x.

## Fixed Version Constraints

Now using version ranges for better compatibility:
- `huggingface-hub>=0.19.3,<1.0` - Compatible with transformers 4.x
- `transformers>=4.36.0,<5.0` - Modern enough for features, <5.0 for compatibility

## Still Getting Errors?

### Error: "No module named 'transformers'"
```bash
pip install transformers
```

### Error: "No module named 'sentence_transformers'"
```bash
pip install sentence-transformers
```

### Error: Version conflict persists
```bash
# Nuclear option - remove all and reinstall
pip freeze | xargs pip uninstall -y
pip install -r requirements_gradio.txt
```

## Testing

After fixing, test the import:

```bash
python -c "from app.orchestrator import Orchestrator; print('✓ All imports successful')"
```

If successful, you'll see:
```
✓ All imports successful
```

## Running the App

```bash
# Start the Gradio app
python app.py
```

The app should now start without import errors!